Gaya APA
Sopher, Charles D.. (1978).
Soils and soil management .
Virginia:
Reston Publishing Company.
Gaya Chicago
Sopher, Charles D..
Soils and soil management.
Virginia:
Reston Publishing Company,
1978.
Tesis.
Gaya MLA
Sopher, Charles D..
Soils and soil management.
Virginia:
Reston Publishing Company,
1978.
Tesis.
Gaya Turabian
Sopher, Charles D..
Soils and soil management.
Virginia:
Reston Publishing Company,
1978.
Tesis.